论文标题
标量$ f_0（500）$和$ f_0（980）$ ressonances and vector mesons in the cabibbo抑制的衰减$λ_c\ to p k^+k^ - $＆pπ^+π^ - $
The scalar $f_0(500)$ and $f_0(980)$ resonances and vector mesons in the single Cabibbo-suppressed decays $Λ_c \to p K^+K^-$ and $pπ^+π^-$
论文作者
论文摘要
在手性统一的方法中，我们研究了单个cabibbo抑制的损失，损失了$λ_c\ to pk^+k^ - $和$λ_c\ topπ^+π^ - $，考虑到$ s $ s $ -wave meson-meson-meson互动，以及从IntermedMediate Vectors的贡献以及$ $ $ $ $ c^0。对于$λ_c\ to $λ_c\ $λ_c\ to p ϕ $，我们的理论结果是$λ_c\ wit p \ bar {k}^{*0} $和$λ_C\ $λ_c\ to p ϕ $的理论结果是与实验数据一致的。在图片中，标量共鸣$ f_0（500）$，$ f_0（980）$和$ a_0（980）$是从$ s $ -Wave中的pseudoscalar-pseudoscalar互动中动态产生的pk^+k^ - $和$λ_c\ topπ^+π^ - $。可以找到$ f_0（500）$的宽大凸起结构，而在$π^+π^ - $ f_0（980）$的狭窄峰值中，decay $λ_c\ topπ^+π^ - $不变的质量分布。对于$ k^+k^ - $不变的质量分布，除了$ ϕ $梅森的狭窄峰外，还附近还有一个增强结构，主要是由于$ f_0（980）$的贡献。 $π^+π^ - $和$ k^+k^ - $不变的质量分布都与besiii的测量兼容。我们鼓励我们的实验同事测量这两个衰退，这有助于了解$ f_0（500）$，$ f_0（980）$和$ a_0（980）$的性质。
In the chiral unitary approach, we have studied the single Cabibbo-suppressed decays $Λ_c\to pK^+K^-$ and $Λ_c \to p π^+π^-$ by taking into account the $s$-wave meson-meson interaction as well as the contributions from the intermediate vectors $ϕ$ and $ρ^0$. Our theoretical results for the ratios of the branching fractions of $Λ_c\to p \bar{K}^{*0}$ and $Λ_c\to p ω$ with respect to the one of $Λ_c\to p ϕ$ are in agreement with the experimental data. Within the picture that the scalar resonances $f_0(500)$, $f_0(980)$, and $a_0(980)$ are dynamically generated from the pseudoscalar-pseudoscalar interactions in $s$-wave, we have calculated the $K^+K^-$ and $π^+π^-$ invariant mass distributions respectively for the decays $Λ_c\to pK^+K^-$ and $Λ_c\to pπ^+π^-$. One can find a broad bump structure for the $f_0(500)$ and a narrow peak for the $f_0(980)$ in the $π^+π^-$ invariant mass distribution of the decay $Λ_c\to pπ^+π^-$. For the $K^+K^-$ invariant mass distribution, in addition to the narrow peak for the $ϕ$ meson, there is an enhancement structure near the $K^+K^-$ threshold mainly due to the contribution from the $f_0(980)$. Both the $π^+π^-$ and $K^+K^-$ invariant mass distributions are compatible with the BESIII measurement. We encourage our experimental colleagues to measure these two decays, which would be helpful to understand the nature of the $f_0(500)$, $f_0(980)$, and $a_0(980)$.
